Solid A and solid B were dissolved into two separate graduated cycliders
each containing 270 mL of water.
Solid A
Solid B
Which statment best describes the dissolving reaction of solid A and solid B
A. The dissolving reactions of both A and B were endothermic.
B. The dissolving reaction of both A and B were exothermic.
C. The dissolving reaction of A was exothermic and the dissolving of reaction B was
endothermic
D. The dissolving of reaction A was endothermic and the dissolving of reaction B was
exothermic

Answer:

Fluorine is the most reactive because it has 7 electrons in the outer shell. The conclusion of this element's chemical reactivity is valid .

Explanation:

Among all the given elements - Boron ,Fluorine , Silicon and Gallium , Fluorine is the most reactive element because it has 7 electrons in the outer shell. It has a very small size and only requires one electron to get into a stable configuration with that of noble gases. Thus, to reach that stable state, they react spontaneously with elements, leading to its high reactivity.

Therefore, most reactive elements are in the halogen band, and none of the other three elements called Boron, Silicon and Gallium belong to the halogen group.

Hence, the correct answer is B (fluorine is the most reactive because it has 7 electrons in the outer shell).

Answer: The answer is b for sure

Explanation: Because, I took the test

Answer:

17

Explanation:

Mass number = # of protons + # of neutrons

Mass number is calculated using ONLY protons and neutrons. Electrons are not in the count.

Thus, we simply add them together: 8 + 9 = 17

This element is Oxygen - 17.

Answer:

gravity's is why I can sit or jump and not fly into space and is why we have a atmosphere. basically gravity is why my daily life even exist.

Explanation:

Answer:

Gravity keeps us grounded. it helps us everyday just to stay on the ground. If we didnt have gravity we would just flout away.

Answer:

um... hydrogen gas

gold metal

sugar (sucrose)

Answer: According to NASA, after inflation the growth of the universe continued, but at a slower rate. As space expanded, the universe cooled and matter formed. One second after the Big Bang, the universe was filled with neutrons, protons, electrons, anti-electrons, photons and neutrinos.

Explanation:Hopefully this helps!

Answer:

u didn't list anything

Explanation:

buh water and oxygen forming hydrated iron

Answer:

Forces inside the atom

The atom is comprised of three major particles—protons, neutrons and electrons. There are four forces (Electromagnetic, Strong, Weak, and Gravity) that are responsible for the behavior of the particles and thus keep the atom together.

Answer:

No

Explanation:

There is only one Nitrogen on the left side while there are 2 on the right. Also there is zero oxygen on the left side and two on the right. The amounts of hydrgen arent equal to each side either.

Answer: To determine the most abundant isotopic form of an element, compare given isotopes to the weighted average on the periodic table.

Answer:

all of above

Explanation:

Answer:

ground state

Explanation:

A ground state is when the electron is closest to the nucleus.

The ground state of an electron is the state of the lowest energy for that electron. The nucleus is surrounded by electrons that occupy orbitals of varying energy levels.

When an electron jumps to an energy state greater than its ground state, then it is in an excited state. An electron can become excited from the ground state to the excited state if it is given extra energy in the form of a photon, or packet of light.

An electron occupies the lowest energy level that is closer to the nucleus when the electron is present in the ground state.

Learn more about the ground state of an atom, here:

https://brainly.com/question/2289096

#SPJ2

Answer:

13.5 moles Ne

Explanation:

Atoms --> Moles

1. Put the given number over 1

2. Multiply by 6.022x10^23 to get to moles

3. Round by sigfigs

(8.15x10^24 atom Ne(g)/1) (1 atom Ne(g)/6.022x10^23molesNe)=13.5337...

13.5337 --> 13.5 moles Ne

Answer:

A continuous spectrum can identify elements by the presence of dark bands, and it also tells scientists how hot the object is: As the temperature goes up, the spectrum has increasing amounts of green, blue and violet colors. Relatively cool objects have a spectrum that has mostly deep red or red and yellow.

Explanation:

Answer:

a.20g/cm

hope this helps :)

Explanation:

Answer:

b

Explanation:

Option a, c and d are correct.

The following information should be considered;

learn more: https://brainly.com/question/15959704?referrer=searchResults

Answer:

It represents a  partially permeable membrane

Explanation:

As the water is added to the teabag it causes the tea leaves to move and triggers diffusion of the leaves. ... The addition of heat (from the hot water) to the tea bag causes its molecules to move much faster than at room temperature

Answer:

The cell membrane

Explanation:

I checked it and it’s right on A P E X. I hope this helps!!

Proof:

Answer:

saturated hydrocarbons are called paraffin:)

Mercury, Venus, and Mars are all rocky planets. None are more or less different than Earth. Earth is the largest and the only planet with extensive regions of liquid water.

Explanation:

Answer:

En nuestro sistema solar, hay cuatro planetas terrestres, que también son los cuatro más cercanos al sol: Mercurio, Venus, Tierra y Marte. Durante la formación del sistema solar, probablemente hubo más planetoides terrestres, pero se fusionaron entre sí o fueron destruidos.

Answer:

N = 32 atoms

Explanation:

The radioactive elements decays as follows:

Ln (N/N₀) = -kt

Where N are number of atoms after t time, N₀ are initial number of atoms, k is decay constant in time⁻¹

We can obtain k from t(1/2):

k = ln 2 / t(1/2)

k = 0.02236s⁻¹

Ln (N/128 atoms) = -0.02236s⁻¹*62s

(N/128 atoms) = e^-1.386

N/128 atoms = 0.25

N = 128 atoms * 0.25

Answer:

all cells come from other cells

Answer:

are there answer choices with the question?

Explanation:

sorry im a little confused

Answer:

I think they use water,shovel,and rake.

Explanation:I was in ag in 8th grade and first we used a rake and raked all the stuff up. Then we waterd the dirt. Then dug a hole and planted the plant and waterd it after.

I hoped this help have a nice day! Comment if you need more help.

Also please rate 5 and give thanks.

Answer:

I don't have an answer but did you ever get it?

Explanation:

I need help.

Answer:

38.9 grams of [tex]BaCl_2[/tex]

Explanation:

0.187 mol BaCl2 x [tex]\frac{208 g}{1 mol}[/tex]

0.187 m x 208 g/m

0.187 x 208 g

38.896 g --> 38.9 g BaCl2

Answer:

B

Explanation:

It was the correct answer when I answered it

The part of the wave that the arrow is pointing to is the crest.

Hence we can conclude that the part of the wave that the arrow is pointing to is the crest.

Learn more here: https://brainly.com/question/1959770